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This paper proposes a digital audio watermarking algorithm based on discrete wavelet transform (DWT), singular value decomposition (SVD) and independent component analysis (ICA). Firstly, it preprocesses original audio to select the appropriate fragments to embed watermark when embedding a watermark. It uses three level wavelet transform to the original audio and singular value decomposition to the...
In the past video restoration algorithms using exemplar-based method, the exhaustive strategy of searching for the best matching patch is always used, which makes the computation very heavy. Moreover the accumulated matching error easily leads the wrong information spread. So a novel fast video inpainting algorithm is proposed in this paper. When restoring the damaged background, the information is...
Utilizing the coupling matrix of optical couples, we analyze the time delay of the transmitted and reflected wave in active single-ring and double-ring microresonator (MR) systems. Our research reveals that the group delay of output field relays on the coupling coefficient in the single-ring miscroresonator system. In the presence of gain in the microresonator, the increase of the gain will lead to...
According to the modulation principles of orthogonal frequency division multiplexing (OFDM) and wavelet packet modulation (WPM), this paper discusses the modulation identification for WPM signals from the OFDM signals based on fractional Fourier transform (FRFT). The FRFT clustering area of the signals is used as the classification feature parameter. Simulations are carried out in additive white Gaussian...
How to mine outliers of online data streams in a short time is an unsolved problem. We propose a new outlier factor metric whose name is the frequent pattern contradiction outlier factor called FPCOF for short. FPCOF can easily measure the degree to which each data instance in data streams is considered as an outlier. In order to compute FPCOF, we construct an outlier detection tree (or OD-tree in...
Wavelet modulation (WM) signal is a special kind of multi-carrier modulation signals (MCMS). Based on the time-frequency characteristics of WM signal, this paper use the mixed moments of the adaptive optimal kernel (AOK) time-frequency distribution to study the identification of multi-carrier modulation signals. Simulation results show that, this method can separate wavelet modulation signal from...
The notion of update pattern awareness in the context of continuous queries over relations, streams and sliding windows was introduced in previous researches. This investigation concerns the access costs of data structures for the intermediate results or final results of continuous query processing over sliding windows by update pattern awareness.The ladder structure was employed to store intermediate...
Wavelet modulation is a new type of multi-carrier modulation, this paper based on the asymptotically Gaussian distribution and frequency spectrum's feature of OFDM and wavelet modulated (WM) signal, studies the recognition of wavelet modulated signal in the additive white Gaussian noise channel. Using the joint estimation of the signal to noise ratio (SNR) and features value based on higher order...
In this paper, we unify the characteristic that motion region is retained in MPEG encoding and human visual system (HVS), propose a color video watermarking algorithm based on dual tree complex wavelet transform (DTCWT) and motion estimation. The watermark is embedded in motion block with highly texture, which analyzed by DTCWT with its attractive properties of shift invariance and good directional...
Wide-area distribution raises significant performance problems for traditional query processing techniques as data access becomes less predictable due to link congestion, load imbalances, and temporary outages. Non-blocking joining query execution is a promising approach to coping with unpredictability in such environments because of reactively scheduling background processing. Classical non-blocking...
In data streams or Web scenario at highly variable and unpredictable rates, most fast join algorithms to date rely upon shifting to external join stage as soon as possible when blocked in order to enhance efficiency. But they have trouble with the following issues: the limit of external join and practical executing time. Classical progressive two-way joining technique based on hash, however, fail...
Wavelet modulation (WM) is a new type of modulation. This paper mainly studies the identification of wavelet modulated signals. Since the signal's instantaneous frequency evaluated with radian is circular, we extract a feature which is based on high order trigonometric moment of signals' instantaneous frequency to identify wavelet modulation. The computer simulation result indicts that the feature...
The blind signature scheme is a protocol for obtaining a signature from a signer, but the signer is unable to view the contents of the message he signs. It is very important technologies in secure e-commerce. Recently the bilinear pairing such as Weil or Tate pairing on elliptic curves and hyperelliptic curves has been found various applications in cryptography. Several ID-based cryptosystems using...
It is very important to estimate the capacity of the watermark information that can be embedded in a digital image. This paper proposes a new the digital image watermarking capacity estimation method by selecting the reliable channels in the wavelet domain. Based on the JPEG2000 compress principle and the human vision system(HVS) characteristics, find out the maximal watermarking capacity under the...
In this paper, an video watermarking algorithm that based on wavelet domain is proposed. In order to enhance the robustness of the watermark, we propose to classify the wavelet coefficients based on the motion of the objects and the texture complexity of the contents in the video sequence. According to the result of classification and the correlation of frames, the watermark is adjusted adaptively...
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